Home / 21,108.40-31,633.44-20,477.68

Finding the Fourth Proportional to 21,108.40, 31,633.44 and 20,477.68

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Solution

The fourth proportional to 21,108.40, 31,633.44 and 20,477.68 is: 30,688.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.40 : 31,633.44 = 20,477.68 : x
  2. Step 2: Convert to fraction form
    21,108.40/31,633.44 = 20,477.68/x
  3. Step 3: Cross multiply
    21,108.40x = 31,633.44 × 20,477.68
  4. Step 4: Simplify right side
    21,108.40x = 647,779,461.62
  5. Step 5: Solve for x
    x = 647,779,461.62/21,108.40
  6. Step 6: Final answer
    x = 30,688.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.